KDialog very slow on stretch

[solitone <solitone@mail.com>]

Hi,

I recently installed debian stretch with KDE. Everything works pretty well, 
exept for KDialog, which is very slow. It takes 30 seconds or so to open, and 
allow me to choose for a filename, a target directory, and so on. Everything 
else in KDE is instantaneous, instead. When KDialog finally starts, it works 
normally. It's just the initial time required to start it up that is bad.

My feeling is that it was some recent package upgrade that ruined it. If I 
remember right, after installation I didn't have this problem. I'm not sure 
though.

Do you have any suggestion about where I should investigate to try and fix 
this?

Thanks,
  Davide